CN101840058A - Inverted telephoto objective inducing optical system - Google Patents
Inverted telephoto objective inducing optical system Download PDFInfo
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- CN101840058A CN101840058A CN 201010172941 CN201010172941A CN101840058A CN 101840058 A CN101840058 A CN 101840058A CN 201010172941 CN201010172941 CN 201010172941 CN 201010172941 A CN201010172941 A CN 201010172941A CN 101840058 A CN101840058 A CN 101840058A
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Abstract
The invention discloses an inverted telephoto objective inducing optical system, which comprises sequentially an infrared objective group and a lens group which are arranged on the same optical axis. An optical path inclined relative to the optical axis between the infrared objective group and the lens group is provided with a rotatable filter wheel. The filter wheel is provided with a plurality of windows. Bandpass filters are arranged in the windows respectively. The bandpass filters in different windows have different wavelength ranges. An MTF transfer function of infrared objective lenses in the invention can show that the lens designed by the invention has excellent resolving capability and contrast in a certain spatial frequency range, meets the requirements of an infrared imaging system, further solves the problem that the structure space cannot be met due to an excessive short back focus, and utilizes a mode of an inverted telephoto objective to improve imaging quality by coordination of different materials and three evenorder non-spherical facial types.
Description
Technical field
The present invention relates to the optical gauge field, especially a kind of optical system that infrared eye was collected and be passed to the infrared radiation of object is specially a kind of inverted telephoto objective inducing optical system.
Background technology
The method of at present more external infrared transmission formula object lens import optical systems two gummeds or the two separation object lens of adopting design more, positive lens uses low chromatic dispersion material in two cemented objectives, the high chromatic dispersion material of negative lens, except energy spherical aberration corrector, sinusoidal difference and assurance focal power, all right correcting chromatic aberration, but in fact available infra-red material is also few, usually separately with two lens, there is certain airspace the centre, the curvature of adjacent lens face also can be unequal, this just can be in a big way the selection of material.Middle infrared often adopts silicon and germanium as lens material now.With regard to 9 ° x6.8 ° of the optical filter size in the total system and desired field of view angle, the focal length of this infrared objective needs just can reach the observation requirement about 60mm, but because of rotating mechanism is arranged in the subsequent optical path, so this infrared objective must be designed to the objective system of a short focal length, long rear cut-off distance.
Summary of the invention
The purpose of this invention is to provide a kind of inverted telephoto objective inducing optical system, too small to solve the rear cut-off distance that the measurement of infrared transmission object lens import optical system brings in the prior art, be unfavorable for the problem of follow-up integrally-built installation.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of inverted telephoto objective inducing optical system, include the infrared objective group, the lens combination that are provided with optical axis successively, it is characterized in that: described relatively inclined light shaft is provided with rotating filter wheel on the light path between described infrared objective group and the lens combination, have a plurality of windows on the described filter wheel, be separately installed with bandpass filter in the window, the bandpass filter wavelength coverage in the different windows is all inequality.
Described a kind of inverted telephoto objective inducing optical system, it is characterized in that: described infrared objective group comprises first negative lens, second negative lens and the positive lens that is provided with optical axis successively, light path between described first, second negative lens is provided with diaphragm, and two minute surfaces of described second negative lens, positive lens are even aspheric surface face type towards the minute surface of second negative lens.
Described a kind of inverted telephoto objective inducing optical system is characterized in that: have five windows on the described filter wheel, described window is evenly distributed on the filter wheel by circumference, and corresponding bandpass filter has five.
Described a kind of inverted telephoto objective inducing optical system is characterized in that: the wavelength coverage of described bandpass filter is respectively: 2.7～2.95 μ m, 3～4 μ m, 3.6～4.2 μ m, 4.2～4.45 μ m, 4～5 μ m.
Described a kind of inverted telephoto objective inducing optical system is characterized in that: the described relatively inclined light shaft angle of described filter wheel is 30 degree.
The present invention utilizes anti-telephoto objective formula, in 9 ° of x6.8 ° of scopes five kinds of bandpass filters (2.7～2.95 μ m, 3～4 μ m, 3.6～4.2 μ m, 4.2～4.45 μ m, 4～5 μ m) are arranged in the visual field, size is 17 * 28mm, be installed on the filter wheel, on main optical path, place at an angle.The actual installation structure need make rear cut-off distance be amplified to more than 3.5 times of focal length, be effective spherical aberration corrector and some off-axis aberration, three faces adopt even aspheric surface face type in the system, thereby improve the accuracy of measurement, and the sheet number that therefore reduces lens greatly (has only been used 3 lens, if then need 6-7 sheet lens just can be effective without aspheric surface), control cost as much as possible.
Be provided with the infrared objective group among the present invention, be disposed with optical filter, lens combination on the subsequent optical path of infrared objective group, from the photoimaging of lens combination outgoing on infrared eye; Optical filter is five kinds of bandpass filters (2.7～2.95 μ m, 3～4 μ m, 3.6～4.2 μ m, 4.2～4.45 μ m, 4～5 μ m), and size is 17 * 28mm, is installed in respectively on the version of filter wheel; Lens combination be with the picture on the optical filter again secondary imaging to infrared eye.
Infrared objective is made of the negative, positive light group of separating, negative light group is made of first negative lens, positive light group is made of second negative lens, positive lens, light group near object space has negative power, be called preceding group, have positive light coke near the light group as the plane, be called the back group, diaphragm is located in the middle of the negative, positive light group.Incident light is through after bearing group, and an axle outer light beam has bigger height of incidence, has produced bigger elementary off-axis aberration and senior off-axis aberration.When the visual field was little, preceding group can be adopted the monolithic negative lens.The off-axis aberration that preceding group produces can be made every effort to itself and be solved, and remaining amount can be organized compensation by the back.Bear bigger aperture for back group of anti-telephoto objective, its visual field since preceding group disperse function reduce to some extent.For spherical aberration corrector and some off-axis aberration, back two mirrors of group have three faces to adopt even aspheric surface face type.After incident ray was dispersed through preceding group, warp was organized later and is converged on the focal plane again.Owing to be positioned in the close picture space of just organizing on plane, right side as square interarea, so back work distance can be greater than focal length.The focal length here is about 60mm, and rear cut-off distance is about 220mm, approximately is 3.5 times of focal length.
MTF transport function by infrared objective camera lens among the present invention can be found, the camera lens of native system design has good resolution and contrast in certain spatial frequency range, satisfy the demand of infrared imaging system, and then solution is too short because of rear cut-off distance, the problem that can't satisfy on the structure space.The mode of utilizing anti-telephoto objective has improved image quality by cooperation and three even aspheric surface face types of different materials.Specifically, the present invention has the following advantages:
(1), adopt the anti-effect that far infrared object lens imaging method realizes short focal length, long rear cut-off distance of taking the photograph, thereby provide installing space for follow-up optical-mechanical system;
(2), adopt positive negative lens group spherical aberration corrector, the aberration of different materials, finish correction work in conjunction with diaphragm simultaneously to off-axis aberration;
(3), wherein two mirrors during the back is organized have three faces to adopt even aspheric surface face type, have also reduced the sheet number of eyeglass in better control aberration.
Description of drawings
Fig. 1 is an optical system diagram of the present invention.
Fig. 2 is an infrared objective group optical structure chart of the present invention.
Embodiment
As shown in Figure 1 and Figure 2.A kind of inverted telephoto objective inducing optical system is provided with one group of infrared objective group 1, is disposed with filter wheel 2, lens combination 3 on the subsequent optical path of infrared objective group 1, infrared eye 4.Infrared objective group 1 is that the first negative lens a, the second negative lens b and positive lens c form with optical axis successively, infrared objective group 1 adopts the anti-structure far away of taking the photograph, constitute by the negative, positive light group of separating, form by three mirrors respectively, one of preceding group, two of back groups are selected the material of silicon (Si) as preceding group first negative lens a for use, germanium (Ge) is as the material of the second negative lens b in the group of back, and silicon (Si) is as the material of positive lens c in the group of back.Reach best picture element effect by the spacing between radius-of-curvature, thickness and each eyeglass of continuing to optimize eyeglass.In addition, have three faces to adopt even aspheric surface face type in two mirrors in the group of back, wherein two of the second negative lens b minute surfaces, positive lens c are even aspheric surface face type towards the minute surface of the second negative lens b.Have five windows in the filter wheel 2, the bandpass filter of a wavelength coverage is installed in each window, five kinds of bandpass filter wavelength coverages are respectively 2.7～2.95 μ m, 3～4 μ m, 3.6～4.2 μ m, 4.2～4.45 μ m, 4～5 μ m, size is 17 * 28mm, be installed on the filter wheel, filter wheel is 30 degree and is obliquely installed on main optical path.The infrared radiation incident light of object converges on the optical filter of filter wheel 2 after entering infrared objective group 1, and scioptics group 3 is imaged onto on the infrared eye 4 again.
Claims (5)
1. inverted telephoto objective inducing optical system, include the infrared objective group, the lens combination that are provided with optical axis successively, it is characterized in that: described relatively inclined light shaft is provided with rotating filter wheel on the light path between described infrared objective group and the lens combination, have a plurality of windows on the described filter wheel, be separately installed with bandpass filter in the window, the bandpass filter wavelength coverage in the different windows is all inequality.
2. a kind of inverted telephoto objective inducing optical system according to claim 1, it is characterized in that: described infrared objective group comprises first negative lens, second negative lens and the positive lens that is provided with optical axis successively, light path between described first, second negative lens is provided with diaphragm, and two minute surfaces of described second negative lens, positive lens are even aspheric surface face type towards the minute surface of second negative lens.
3. a kind of inverted telephoto objective inducing optical system according to claim 1 is characterized in that: have five windows on the described filter wheel, described window is evenly distributed on the filter wheel by circumference, and corresponding bandpass filter has five.
4. a kind of inverted telephoto objective inducing optical system according to claim 1 is characterized in that: the wavelength coverage of described bandpass filter is respectively: 2.7～2.95 μ m, 3～4 μ m, 3.6～4.2 μ m, 4.2～4.45 μ m, 4～5 μ m.
5. a kind of inverted telephoto objective inducing optical system according to claim 1 is characterized in that: the described relatively inclined light shaft angle of described filter wheel is 30 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010172941 CN101840058B (en) | 2010-05-11 | 2010-05-11 | Inverted telephoto objective inducing optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010172941 CN101840058B (en) | 2010-05-11 | 2010-05-11 | Inverted telephoto objective inducing optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101840058A true CN101840058A (en) | 2010-09-22 |
| CN101840058B CN101840058B (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010172941 Expired - Fee Related CN101840058B (en) | 2010-05-11 | 2010-05-11 | Inverted telephoto objective inducing optical system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07261076A (en) * | 1994-03-24 | 1995-10-13 | Nikon Corp | Wide-angle lens |
| JP2001042380A (en) * | 1999-07-27 | 2001-02-16 | Canon Inc | Photographing device |
-
2010
- 2010-05-11 CN CN 201010172941 patent/CN101840058B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07261076A (en) * | 1994-03-24 | 1995-10-13 | Nikon Corp | Wide-angle lens |
| JP2001042380A (en) * | 1999-07-27 | 2001-02-16 | Canon Inc | Photographing device |
Non-Patent Citations (1)
| Title |
|---|
| 《光子学报》 20081031 闫阿奇 用于航天的高分辨率大视场光学系统设计 1975-1977 第37卷, 第10期 2 * |
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| CN101840058B (en) | 2012-12-19 |
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